I NEED MY WORK DONE

23 Jul I NEED MY WORK DONE

This type of selection favors both extremes of the phenotype spectrum within a population.

	A.	disruptive
	B.	natural
	C.	neutral
	D.	stabilizing
	E.	directional

5 points

Question 2

 

On a molecular level, all organisms

	A.	have the same bases in DNA and RNA, the same amino acids in proteins, but use different genetic codes.
	B.	have the same bases in DNA and RNA, the same amino acids in proteins, and use the same genetic code.
	C.	use different means of storing genetic information.
	D.	have the same bases in DNA and RNA, but different amino acids in proteins.
	E.	show no similarities.

5 points

Question 3

 

Most mutations lead to a decreased chance of survival for the mutant organism. Rarely, a mutation can provide an increased chance of survival. These rare mutations provide a(n) _____________________ for the mutant.

	A.	selective disadvantage
	B.	environmental susceptibility
	C.	adaptive
	D.	directional shift
	E.	selective advantage

5 points

Question 4

 

After being produced in the seminiferous tubules, sperm mature in the

	A.	seminal vesicle.
	B.	vas deferens.
	C.	epididymis.
	D.	ejaculatory duct.
	E.	urethra.

5 points

Question 5

 

Random changes in gene frequency that occur in small populations describes the concept of

	A.	genetic drift.
	B.	adaptive radiation.
	C.	parapatric speciation.
	D.	sympatric speciation.
	E.	convergent evolution.

5 points

Question 6

 

The primary male hormone is

	A.	produced throughout a male’s entire lifetime.
	B.	produced in the brain.
	C.	testosterone.
	D.	estrogen.
	E.	only involved in sperm production.

5 points

Question 7

 

Which of the following statements about natural selection is true?

	A.	Natural selection leads to increased likelihood of survival for certain individuals based on variation. The variation must come from outside the population.
	B.	Natural selection results in those individuals within a population who are best-adapted surviving and producing more offspring.
	C.	Natural selection causes variations to arise within a population.
	D.	All individuals within a population have an equal likelihood of survival. Survival is based on chance.
	E.	Natural selection leads to extinction.

5 points

Question 8

 

Which of the following is not true of the punctuated equilibrium theory?

	A.	It was inspired in part by patterns observed in the fossil record.
	B.	It suggests that most species undergo little phenotypic change during most of their evolutionary duration.
	C.	It suggests that subgroups diverge and evolve at about equal and constant rates.
	D.	It appears to be well supported by the fossil record.
	E.	It proposes that most evolutionary change is concentrated in relatively brief episodes of change.

5 points

Question 9

 

Animals that possess both male and female sexual organs

	A.	are hermaphroditic and typically cross-fertilize.
	B.	are dioecious and typically self-fertilize.
	C.	are parthenogenetic and typically self-fertilize.
	D.	are hermaphroditic and typically self-fertilize.
	E.	are dioecious and typically cross-fertilize.

5 points

Question 10

 

Human chorionic gonadotropin (hCG)

	A.	acts as a hormone signaling menstruation.
	B.	can be used to reveal pregnancy.
	C.	is needed to form the placenta.
	D.	is stored in the ovaries.
	E.	is produced by the amnion.

5 points

Question 11

 

Chemical compounds secreted by mammals and insects to communicate sexual readiness are called

	A.	hormones.
	B.	pheromones.
	C.	developers.
	D.	testosterones.
	E.	estrogens.

5 points

Question 12

 

Vestigial organs

	A.	did not have a function when they first developed, but do so today.
	B.	are not found in present-day organisms.
	C.	include the human appendix and wisdom teeth and a snake’s hipbones.
	D.	must have evolved individually in different organisms.
	E.	are similar in many organisms.

5 points

Question 13

 

Negative feedback loops act to

	A.	cause expulsion of milk during breastfeeding.
	B.	cause an erection of the penis when stimulated.
	C.	control sperm production.
	D.	cause uterine contractions during childbirth.
	E.	cause milk production after childbirth.

5 points

Question 14

 

Which of the following is the best description of an adaptation?

	A.	a trait that will be beneficial in the future
	B.	a trait that is of no advantage to survival
	C.	a trait that is currently beneficial to survival
	D.	an environmental change that selects for certain traits
	E.	a trait that was beneficial to survival in the past

5 points

Question 15

 

Up until the late eighteenth and early nineteenth centuries, many naturalists believed that all species of living organism(s) had been created separately and had remained unchanged since the creation. Around that time, scientific research provided findings that were contradictory to that idea. All of the following are findings that contradict the idea of a single creation. Choose the exception.

	A.	Even though the limbs of various mammals carry out different functions (swimming, gliding, running, holding, etc.), the bone patterns are very similar.
	B.	The platypus is only found in Australia and the dodo was only found on Madagascar.
	C.	The limbs of some mammals serve the same purpose but their bone patterns are very different.
	D.	Some fossils of extinct organisms are quite different from living organisms.
	E.	As scientists explored more of the earth, they found that different groups of organisms were found in the different regions.

5 points

Question 16

 

Embryonic development includes all of the following except

	A.	organogenesis.
	B.	cleavage.
	C.	gastrulation.
	D.	fertilization.
	E.	growth.

5 points

Question 17

 

Luteinizing hormone (LH) and follicle-stimulating hormone (FSH) are

	A.	produced in the ovaries.
	B.	constantly secreted into the bloodstream of males.
	C.	produced in the testes.
	D.	only produced in female humans.
	E.	produced in both male and female humans.

5 points

Question 18

 

A population in Hardy-Weinberg equilibrium

	A.	consists of allele frequencies that are constantly changing.
	B.	is under no selective pressures.
	C.	is very common in nature.
	D.	consists of genotype frequencies that are constantly changing.
	E.	requires a small population size.

5 points

Question 19

 

As opposed to external fertilization, internal fertilization ensures that

	A.	only the fittest of sperm and egg combinations will survive.
	B.	the number of sperm and eggs produced will be equal.
	C.	sperm and egg will be released simultaneously.
	D.	all of the sperm will fertilize eggs.
	E.	sperm will be protected until they can unite with the eggs.

5 points

Question 20

 

Immature eggs are called

	A.	basal cells.
	B.	ovaries.
	C.	blastocysts.
	D.	oocytes.
	E.	follicles.

5 points

Save and Submit

Click Save and Submit to save and submit. Click Save All Answers to save all answers.