Question

11-The ability of the human body to maintain a relatively constant internal environment is known as homeostasis

Select one:

True

False

12-Children born with Down syndrome have inherited an extra chromosome, so their diploid number is 47 rather than 46 chromosomes. What is this genetic condition called?

Select one:

a.

haploid 21

b.

monoploidy

c. trisomy 21

d.

triploid

13-In which phase of meiosis I do homologues separate?

Select one:

a.

prophase II

b. anaphase

c.

anaphase I

d.

metaphase I

14-Crossing over occurs during ________ and is important because it ________.

Select one:

a. telophase II; creates daughter cells

b.

anaphase II; separates the homologous pairs

c.

metaphase I; reduces the chromosome number by half

d. prophase I; generates variation

15-If a cell begins mitosis with 36 chromosomes, there will be ________ chromosomes in each cell after mitosis, and each daughter cell will be ________ genetically.

Select one:

a. 36; different

b.

18; different

c. 36; identical

d. 18; identical

16-Polar bodies are unique products of ________.

Select one:

a.

spermatogenesis

b.

mitosis

c.

oogenesis

d.

cytokinesis

17-The dark chemical that accumulates in the skin after exposure to the sun is called melanin

Select one:

True

False

18-From which of these phases of cellular respiration does the cell get the most ATP?

Select one:

a.

glycolysis

b. transition reaction

c. electron transport chain

d.

citric acid cycle

19-Albinism is due to the inability to make melanin

Select one:

True

False

20-These skin cells fight infections: neuroglia

Select one:

True

False

Answer 1

11. True

Homeostasis maintain a constant body temperature with respect to the surroundings.

12. c, trisomy 21

There is an extra copy of chromosome 21.

13. c, anaphase I

The homologous chromosomes separate and move to the opposite poles.

14. d, prophase I : variation

Crossing over results in physical exchange between non-sister chromatids and thus leads to genetic diversity or variation.

15. c, 36: identical

Mitosis ensures that newly replicated chromosomes are distributed equally into two daughter cells.

16. c, oogenesis

A polar body is a small haploid cell formed during oogenesis and does not have the ability to be fertilized.

17. True

Melanin is formed by melanocytes by the process of melanogenesis.

18. c, electron transport chain

ETC is responsible for the ATP formation by the ATP synthase complex.

19. True

Albinism results in the lack of melanin pigment from hair and skin.

20. False

Neuroglia provide support and protection to neurons.