Question 3
Which of the following would cause a genetic disease to be inherited by a human embryo?
a
Some of the father's red blood cells expel their nucleus and die after a few weeks.
b
The mother undergoes random genetic changes that lead to cancer in her uterus.
c
The mother's skin cells are exposed to ultraviolet radiation, and they develop tumors.
d
A primary spermatocyte in the father forms a sperm cell with 22 chromosomes.
Question 4
Which of the following are found in all viruses?
What is the coronavirus? Virus science explained | Caltech Science Exchange
a
DNA, RNA, ribosomes, cell wall
b
Nucleus, ribosomes, cell wall
c
DNA or RNA and a protein coat
d
Cell membrane and ribosomes
Question 5
This dark mass on skin, a form of skin cancer, is directly due to
Skin cancer in skin of color - Journal of the American Academy of Dermatology
a
the uncontrolled mitosis and growth of abnormal cells.
b
the crowding of released antigens.
c
meiotic division of normal cells.
d
production of excessive protein inhibitors.
Question 6
The process during which the nucleus of a cell is divided into two identical nuclei is known as____________.
a
fertilization
b
cytokinesis
c
mitosis
d
meiosis
Question 3
**Answer: d**
A primary spermatocyte in the father forms a sperm cell with 22 chromosomes. If a sperm cell with an abnormal number of chromosomes (22 instead of the usual 23) fertilizes an egg, it can lead to a genetic disease due to aneuploidy in the resulting embryo, such as Down syndrome, Turner syndrome, or other chromosomal disorders.
Question 4
**Answer: c**
All viruses have DNA or RNA and a protein coat (capsid). They do not have ribosomes, cell walls, or nuclei.
Question 5
**Answer:
This dark mass on skin, a form of skin cancer, would be due to the uncontrolled mitosis and growth of abnormal cells.
Question 6
**Answer: c**
The process during which the nucleus of a cell is divided into two identical nuclei is known as mitosis.