BIOLOGY COLLEGE

3. Prokaryotic cells are found in the fossil record _______ years ago.

Answers

Answer 1
Answer:

Answer:

4.5 billion years ago

Explanation:

this is correct i guess

Related Questions

When does oxyhemoglobin form during respiration? Group of answer choices during internal respiration immediately after carbon dioxide enters the blood when the chloride shift occurs during external respiration
Pleas help ASAPWhich of these materials is a good conductor of electricity? A. glass b.metalc.rubberd.newspaper
1. What purpose does the regulatory portion of the gene have? 2. In this simulation, the DNA molecule’s different strands are represented as different colors one blue and one red. What is the significance of the two different strands? Are they both used in transcription? 3. There are two required components to initiate transcription on the gene. What are they, and where do they bind on the DNA strand? 4. How would you know if transcription has been successful? 5. How do negative transcription factors impact transcription? 6.Explain the difference in transcription between Gene 1 and Gene 2. Hypothesize the reason for the difference.
Explain Okazaki fragments as applied in DNA replication​
Brainstorm and create a list of 4 human activities that interfere with ecosystems, food chains and food webs. For each explain how it happens, why we do it, and mention short and long term effects

Pattern of evolution in which long stable periods (stasis) are interrupted by brief periods of rapid change

Answers

Answer:

punctuated equilibrium

In prokaryotes, a search for genes in a DNA sequence involves scanning the DNA sequence for long open reading frames (that is, reading frames uninterrupted by stop codons). What problem can you see with this approach in eukaryotes?

Answers

Answer:

DNA in eukaryotes have introns which are the non-coding sequences and are spliced out of primary transcript. They are not present in mature mRNA.

Explanation:

The reading frame of 50 or more nucleotides without any termination codon in between is called an open reading frame. The long open reading frames mostly represent protein-coding genes.

Hence, long open reading frames are searched for in order to find the genes. The presence of introns in eukaryotic DNA does not allow the application of this approach to find genes in eukaryotes.

The post-transcriptional modification of the primary transcript removes the introns. Hence, a mature mRNA does not have introns. Therefore, introns do not contain open reading frames.

Compare the behavior of an endotherm and an ectotherm on a hot summer day. How does each organism respond to changes in the environment?

Answers

Endotherms generate most of the heat they need internally. When it's hot outside, they decrease metabolic heat production to keep their body temperature constant. Because of this, the internal body temperature of an endotherm is more or less independent of the temperature of the environment. 
Contrarily, Ectotherms' body temperature primarily depends on external heat sources. That is, ectotherm body temperature rises and falls along with the temperature of the surrounding environment. So if it is hot outside their body temperature rises as well. 

Answer:

sample response: Endotherms are able to maintain a constant body temperature. An endotherm may respond to a hot summer day by sweating or panting. The body temperature of an ectotherm, on the other hand, changes with its surroundings. In order to stay cool, an ectotherm must move somewhere cooler like the shade of a plant or rock or seek cool water to lay in

Explanation:

Note the mechanism of absorption (passive or active transport) of the following food breakdown products, and indicate by a check mark whether the absorption would result in their movement into the blood capillaries of the lymphatic capillaries (lacteals).Substance Mechanism of absorption Blood Lymph
Monosaccharides
Fatty acids and glycerol
Amino acids
Water
Ca2+ , Na+ , Ca2+

Answers

Answer:

The absorption of monosaccharides takes place via facilitated and cotransport mechanism and is transported through blood capillaries present in the villi.  

The absorption of glycerol and fatty acids takes place through diffusion and the majority of them are transported via lymph capillaries, while some are transported through blood capillaries.  

The absorption of amino acids takes place via a cotransport mechanism with sodium ions and is transported through blood capillaries.  

The absorption of water takes place by the process of osmosis via diffusion and is transported with the help of blood capillaries.  

The absorption of calcium and sodium ions takes place via an active transport mechanism, while the absorption of chlorine takes place via the process of diffusion. The transportation of all these ions takes place with the help of blood capillaries.  

Final answer:

Monosaccharides, amino acids and ions are generally absorbed through active transport into the blood capillaries, while fatty acids and glycerol are transported into the lymphatic capillaries. Water is absorbed via osmosis into both the blood and lymph capillaries.

Explanation:

The absorption mechanisms of the various food breakdown products are different and determine whether they move into the blood capillaries or into the lymphatic capillaries. This absorption is either through passive or active transport.

  • Monosaccharides like glucose are absorbed through active transport into the blood capillaries.
  • Fatty acids and glycerol are also absorbed into the cells lining the small intestine, they are then reassembled into fats and transported into the lymphatic capillaries.
  • Amino acids are absorbed through active transport into the blood capillaries.
  • Water is absorbed mainly via osmosis, a type of passive transport, into both the blood and lymph capillaries.
  • Ions (Ca2+, Na+, Ca2+) are absorbed through active transport into the blood capillaries.

Learn more about Absorption of Food Breakdown Products here:

brainly.com/question/27123978

#SPJ3

Select all that apply.Viral infections can be transmitted by:

coughing
sneezing
insect bites
contaminated water
direct contact

Answers

Answer:

Explanation:

all of them

Scientist use data from Gregor Mendel‘s studies to conclude that information about traits is passed from parents to offspring through

Answers

The correct answer is genes.  

A trait refers to the feature like size or color, which is passed from the parents and is inherited by the offspring. The genes control traits and come in pairs, that is, one gene from each parent.  

The transmission of hereditary traits possesses its molecular framework in the accurate DNA replication. This generates gene copies, which can be transmitted to the offspring from the parents. In plants and animals, the reproductive cells known as gametes are the mediators, which transfer genes from one generation to the next.  

Answer:

According to the data from the experiments of Gregor Mendel, the information about the traits is passed from parents to offspring is through the genes.

Explanation:

  • In Gregor's studies, he stated that factors are inherited from parents to offsprings which are responsible for inheritance of traits lie eye color, hair color etc.
  • Later these factors are named as genes.
  • There are millions of genes which codes for different traits.
  • Genes are units of DNA.
  • There are two copies of gene for one trait in an offspring. One comes from mother and second comes from father.
Other Questions
Why did geneticists believe, even before direct experimental evidence was obtained, that the genetic code would turn out to be composed of triplet sequences and be non overlapping
The end of a nucleic acid strand with a free phosphate group is called the ________.
Why is protein synthesis different in prokaryotes and eukaryote
Today, our current understanding of evolution is an elaboration and refinement of Darwinian evolutionary theory, taking into consideration additional evolutionary mechanisms not predicted by Darwin. This unified theory of evolution is known as :