BIOLOGY HIGH SCHOOL

Which statement is true for cephalochordates? Notochord is present only in the larval stage; it is absent in adults. Notochord is present in the larval stage; it transforms to vertebrae in adults. Notochord is present throughout their lives.

Answers

Answer 1
Answer: Notochord is present in the larval stage; it transforms to vertebrae in adults
Answer 2
Answer:

Answer:

Notochord is present throughout their lives.

Explanation:

Within the phylum of the chordates there are three subphylum. Cephalochordates, Urocordated and Vertebrates. Unlike the others, in the cephalochordates the notochord is present throughout its life, this extends dorsally from the tail to the head. The cephalochordates are considered primitive animals, live in marine waters and they feed by filtering.

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A person who has a weakened immune system may not be able to fight against infection because

Answers

A person with an immune system which is weakened may not be able to fight against infection reason being that the white blood cells which makes up the immune system, fighting off infection and protecting the body against disease which cause organisms are weak.


For a person to be able to fight disease the immune system should be highly complex. For health maintenance thee should be balanced and strong immune system.


Impaired immune response can pose to a serious bad health.

To avoid the influence of immune someone should avoid emotional stress, environmental and chemical exposure and physical stressors for example lack of enough sleep.

Answer:

His immune system cannot fight against invading pathogens.

Explanation:

Weaken immune system represents a state of immunodeficiency, in which immune system of an individual fails to fight properly with infections and cancer.

This is due to inability of body to make functional immune cells, such as neutrophils, T cells, B cells, and macrophages or decreased production of these cells and other components of immune system that provide protection against invading pathogens.

What is the Breaking down of amino acids into urea and uric acids?

Answers

The breakdown of amino acids into urea and uric acids take place in the urea cycle, a biochemical process. 
Aspartate directly donates a nitrogen atom from the formation of urea during the urea cycle.
The argininosuccinate synthase reeaction links aspartate and citrulline via the amino group of aspartate and provides the second nitrogen of urea.
The breaking down of amino acids into urea and uric acids is called Catabolism; from organelles to cells to blood circulation by amino acid transporters. Then, it goes to the liver and the kidneys in the degradation of the amino acid. After the urea cycle; it will then be excreted in the form of urea.

In a sexually reproducing species, evolutioncould occur as a result of
(1) modification of genes in body cells
(2) modification of genes in sex cells
(3) increased reproduction among individuals
with identical chromosomes
(4) recombination of genes in cells reproducing
by mitosis

Answers

In a sexually reproducing species, evolution could occur as a result of Modification of genes in body cells.

Final answer:

Evolution in sexually reproducing species occurs as a result of modification of genes in sex cells. Genetic variation through mutations and genetic recombination during meiosis leads to offspring that are genetically different from their parents, providing the basis for natural selection and evolution.

Explanation:

In a sexually reproducing species, evolution occurs as a result of modification of genes in sex cells. Sex cells, or gametes, such as sperm and eggs, carry genetic information that is passed on to offspring. Genetic variation can arise through mutations or through the process of genetic recombination during meiosis, resulting in offspring that are genetically different from their parents. This genetic variation provides the raw material for natural selection and evolution.

Learn more about Evolution in sexually reproducing species here:

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_______ aid in the immune system to fight infections. A. Red blood cells
B. Platelets
C. Arteries
D. White blood cells

Answers

White blood cells (D) aid in the immune system to fight infections.

How do restriction enzymes precisely cut bacterial plasmids to produce "sticky ends"? Make sure you discuss how the restriction enzyme identifies the target DNA sequence in the plasmid and name the enzyme that "cuts" the DNA.

Answers

A 'sticky' end is produced when the restriction enzyme cuts at one end of the sequence, between two bases on the same strand, then cuts on the opposite end of the complementary strand. This will produce two ends of DNA that will have some nucleotides without any complementary bases.Answer:

Explanation:

Most protists are______.A)Unicellular
B)Heterotrophs
C)Autotrophs
D)Multicellular

Answers

Answer:

Answer A

Explanation:

Fungus are usually single celled organisms.
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