Question

21-In which stage of mitosis does exchange of genetic material between chromosomes (crossing over) occur?

Select one:

a. prophase II

b. prophase I

c. none of the above

d. anaphase I

22-How does a population differ from an ecosystem?

Select one:

a. An ecosystem includes a community, whereas a population does not.

b.

A population consists of all living organisms in the area, whereas an ecosystem consists of all living and nonliving aspects of an area.

c.

An ecosystem and a population are identical; they are two terms for the same concept.

d.

A population consists of all living organisms in an area, whereas an ecosystem consists of only one species.

23-What is decreased during the process of meiosis?

Select one:

a.

All of the above are true.

b.

the number of cells

c. the number of chromosomes

d.

the size of chromosomes

24-A tendon or ligament is made up principally of loose connective tissue.

Select one:

True

False

25-Albinism is an example of ________.

Select one:

a. a polygenic disease

b.

a dominant disease

c. an autosomal recessive disease

d. a sex-linked disease

26-In which phase do the following events occur: the chromatin condenses into chromosomes, the nuclear membrane disintegrates, and the centrioles migrate to the poles as spindle fibers are organized?

Select one:

a.

anaphase

b. prophase

c.

telophase

d. interphase

27-Specific segments of DNA that are the functional units of inheritance are called ________.

Select one:

a.

chromatids

b.

chromosomes

c.

telomeres

d.

genes

28-Glands that lack ducts and secrete hormones are called exocrine

Select one:

True

False

29-Cancer is associated with problems related to the regulation of ________.

Select one:

a.

mitosis

b.

cytokinesis

c.

meiosis I

d. meiosis II

Answer 1

21)- option bis correct because crossing over occur in prophase-1 where recombinant chromosome is formed.

22)- option b is correct because population is group of organisms but in ecosystem we add non living things in environment.

23)- option c is correct because in this process chromosome number is half after division.

24)- option b is correct because it is made up of dense connective tissue.

25)-option c is correct because it is caused by recessive gene.

26)-option b is correct because division start in prophase.

27)-option d is correct because these are passed from parents to offspring.

28)- false . because they release chemical substance through duct.

29)- option b is correct because it is related to cytokinesis.