BIOLOGY HIGH SCHOOL

Each muscle fiber contains tiny threads called _____, which are made of myosin and actin.ligaments
myofibrils
myoactin
ATP

Answers

Answer 1
Answer: Myofibrils are the building blocks or contractile unit of each muscle fiber. The tiniest functional unit of skeletal muscle, the sarcomere, is found in the myofibrils and is made up of protein filaments: actin (thin) and myosin (thick).

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Johannes wants to know whether soil, water, or both are needed for plant growth. He chooses to conduct experiments on a willow tree for five years to answer his question. How can his experimental methods be changed to improve his experiment?
How does a mutation affect a gene? A. A mutation changes the sequence of RNA bases in a gene. B. A mutation creates the sequence of RNA bases in a gene. C. A mutation changes the sequence of DNA bases in a gene. D. A mutation creates the sequence of traits in a gene.
DNA is ultimately responsible for the proteins that are produced in an organism. What is the process (name and describe it) that produces proteins, and what are the roles of chromosomes, DNA, and genes in this process?
How can you identify a fibrous root system
If the base sequence on a DNA molecule is ATC, what would be the mRNA codon sequence?

What two components are often found as part of an enzyme?

Answers

The two components that are often found as part of an enzyme are as follows:

  • A part of the globular protein is known as apoenzyme.
  • A part of non-protein is known as a cofactor or prosthetic group.

What are Enzymes?

An Enzyme may be defined as a form of chemical substance which is produced by living organisms that acts as a catalyst to bring about a specific biochemical reaction inside the body of a living entity.

All enzymes are proteins that are made up of monomers of amino acids which are linked together by a peptide linkage. The presence of both proteinaceous and nonprotein makes an enzyme called a Conjugate enzyme or holoenzyme.

The protein part of the holoenzyme is inactive, while the nonprotein part called the cofactor is required for the catalytic function of the enzyme.

Therefore, the two components of an enzyme are a protein part known as apoenzyme, and a non-protein part known as a cofactor or prosthetic group.

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protein

non-protein, also called a cofactor

HELP ME!! Which structure does a virus have in common with a prokaryotic cell?

Answers

Nucleic acid

Prokaryotic cell

  • A prokaryotic cell is one that lacks a genuine nucleus as well as membrane-bound organelles.
  • Prokaryotes are organisms that have prokaryotic cells and are usually single-celled microbes.
  • The only structure or component that a virus and a cell share in common, according to the information in the Venn diagram, is nucleic acid. The virus is devoid of all other cellular features, and it is unable to exist, prosper, or replicate on its own.
  • A virus and a prokaryotic cell have Nucleic acid in common.

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Viruses are not cells at all, so they are neither prokaryotes nor eukaryotes. Viruses contain DNA but not much else. They lack the other parts shared by all cells, including a plasma membrane, cytoplasm, and ribosomes

Researchers are conducting a study to see if exposure to an occupational toxin leads to brain tumors. The researchers recruit 1,000 men who work at a steel factory (all of whom do not have a brain tumor in 2000) and use questionnaires as well as measuring devices to see who is exposed to the occupational toxin Airflyte. After the baseline assessment, 493 of the workers were exposed to Airflyte while the others were not. After 10 years of follow up, 308 of the workers exposed to Airflyte developed brain tumors while 77 of the men not exposed to Airflyte developed brain tumors. Set up a 2x2 table with the data given.

Answers

Answer:

Explanation:

Based on the information provided, we can set up a 2x2 table to summarize the data as follows:

| Brain Tumor | No Brain Tumor | Total

--------------------------------------------------------

Exposed to Airflyte | 308 | 185 | 493

--------------------------------------------------------

Not Exposed | 77 | 430 | 507

--------------------------------------------------------

Total | 385 | 615 | 1000

In this table, the rows represent the exposure status (exposed to Airflyte or not exposed), and the columns represent the occurrence of brain tumors (brain tumor or no brain tumor). The totals are calculated for each category.

Please note that the numbers provided in the table are based on the given data and do not reflect any statistical analysis or conclusions about the relationship between exposure to Airflyte and the development of brain tumors. Further statistical analysis, such as calculating risk ratios or conducting hypothesis tests, would be necessary to determine the strength of the association between the exposure and outcome variables.

Final answer:

A 2x2 table is set up to represent the brain tumor occurrence and non-occurrence in workers who were and were not exposed to the occupational toxin Airflyte. There were 308 cases of tumors in the exposed group and 77 in the non-exposed group. The rest did not develop tumors.

Explanation:

In conducting this study, the researchers divided the 1,000 men into two groups: those exposed to the occupational toxin Airflyte and those not exposed. By using a 2x2 table, we can clearly illustrate the results obtained after the 10-year follow up. Here's how it looks:

   With Brain Tumor Without Brain Tumor    

Exposure to Airflyte

308 493 - 308 = 185  

No Exposure to Airflyte

77 507 - 77 = 430  

This table helps to visualise the observed differences in brain tumor development among the workers who were exposed to the toxin compared to those who weren't exposed.

Learn more about Health Study Data Organization here:

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Which would be an adaptation in a rainforest, but not in a tundra

Answers

Answer:

A beak that can dig into thick trees
A rainforest has many tall trees, often with large canopies and vines growing. As a result, oftentimes at ground level there are many shadows and darker shaded areas. An adaption to this environment might be dark fur to blend in with the background, so that prey can hide from predators or a predator can sneak up on prey. This wouldn't work as well on the tundra, where there is plenty of light, few trees, and the primary colors of the landscape are the green/yellow of the grasses.

Another example might be the ability to swing from tree to tree as you see with animals like spider monkeys. There are few trees on the tundra so this wouldn't be a useful adaption, but in a rainforest where there are plenty of trees clustered close together this is very useful.

The sequence of an mRNA transcript is UGGCACUCCAG. What will be the sequence of the template DNA strand from which it was synthesized?A.UGGCACUCCAG
B.ACCGTGAGGTC
C.ACCGUGAGGUC

Answers

ACCGTGAGGTC
Therefore your answer is B, it will just be the complementary base pair, with uracil pairing with Adenine.
B. ACCGTGAGGTC is the correct answer

Roots have all of the following functions EXCEPT to ____.a. anchor the plant
c. store food
b. absorb water
d. make food

Answers

Roots have all of the following functions EXCEPT to - d. make food

The root is the part of a vascular plant that is normally underground. Its primary functions are

  • Anchorage of the plant,
  • absorption of water and dissolved minerals
  • conduction of these to the stem, and storage of reserve foods.
  • Conduction of absorbed water and minerals occurs from roots to the other parts of the plants.
  • Storage of food minerals, in some plants, for future needs, and for vegetative propagation.

Thus, Roots have all of the following functions EXCEPT to - d. make food

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The roots do absorb water and is the anchors the plant to stand it up. But it does not make food by itself
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