Anonymous asked in Science & MathematicsBiology · 8 years ago


Question 1

A disease that is caused by the inability of the immune system to distinguish between healthy and unhealthy cells is called a(n)


a. tissue rejection disease.

b. autoimmune disease.

c. opportunistic disease.

d. immune deficiency disease.

Question 2

The production of luteinizing hormone and follicle-stimulating hormone marks the beginning of which life stage?


a. aging

b. pregnancy

c. puberty

d. infancy

Question 3

What distinguishes an allergen from other antigens?


a. They are found only on pollen.

b. They lead to tissue rejection.

c. They do not cause disease.

d. They produce active immunity.

Question 8

Which is the term that describes a disease that can be passed from one person to another?


a. infectious

b. acquired

c. resistant

d. parasitic

Question 9

The fluid-filled structure in which the embryo is protected during pregnancy is called the


a. chorionic villi.

b. endoderm.

c. amniotic sac.

d. umbilical cord.

Question 10

Which part of the brain forms responses such as thought and movement?


a. cerebellum

b. cerebrum

c. brain stem

d. spinal cord

Question 11

Which of the following describes the result of Robert Koch's experiments?


a. hypotheses that suggest germs are communicable

b. conditions that prove a pathogen causes a disease

c. procedures that describe how to isolate a pathogen

d. techniques that prevent the transmission of pathogens

Question 12

Which event can result in the birth of identical twins?


a. fertilized egg splits into two zygotes

b. attachment of two eggs to the uterus

c.penetration of two eggs by two sperm

d. penetration of one egg by two sperm

Question 14

Before a fetus can pass through the birth canal, contractions must dilate the


a. placenta.

b. uterus.

c. cervix.

d. ovaries.

Question 15

The AV node signals the heart's ventricles to contract, pumping oxygen-poor blood from the right ventricle into the


a. atria.

b. pulmonary vein.

c. aorta.

d. pulmonary artery.

Question 16

Which of the following is a function of your brain stem?


a. to stimulate the muscles that maintain your balance

b. to coordinate your heart beat and breathing

c. to produce signals that allow you to move

d. to gather impulses from your PNS

Question 18

Which structure enables the exchange of nutrients between mother and fetus?


a. uterus

b. placenta

c. ovary

d. amnion

Question 19

During which trimester is a fetus most at risk for damage caused by mutation or genetic errors?


a. all

b. first

c. second

d. third

Question 20

Pulmonary circulation occurs only between the heart and the


a. limbs.

b. organs.

c. lungs.

d. brain.

Question 21

Which of the following causes pathogens to clump together, making them easier to destroy?


a. complement proteins

b. interferons

c. antibiotics

d. antibodies

Question 23

Which nervous system uses interneurons that interact with other nerves in the body?


a. the somatic nervous system

b. the autonomic nervous system

c. the peripheral nervous system

d. the central nervous system

Question 24

Immunity that protects an entire species from infection is a type of


a. active immunity.

b. inherited immunity.

c. passive immunity.

d. acquired immunity.

Question 25

The parasympathetic nervous system is activated when you


a. sit thinking.

b. lift a hammer.

c. run a race.

d. hear a telephone ring

Question 26

Permanently high blood pressure is called


a. hypertension.

b. stroke.

c. arteriosclerosis.

d. atherosclerosis.

Question 27

Which of the following events is characteristic of childhood?


a. development of fine-motor skills

b. ability to sit and stand with support

c. vocabulary of several simple words

d. growth of about 10 inches per year

Question 28

A pulmonary vein differs from most veins in that it carries


a. its own blood supply.

b. more carbon dioxide

c. oxygen-rich blood.

d. twice as much blood.

Question 29

Which event is a characteristic of the third trimester of pregnancy?


a. lungs are fully developed

b. heart begins to beat

c. fingers are forming

d. embryo first moves

Question 30

Immunity provided by a vaccine is a type of immunity called


a. genetic immunity.

b. inherited immunity.

c. passive immunity.

d. acquired immunity.

3 Answers

  • 8 years ago
    Favorite Answer

    q.2- puberty

    q.3- they r found only on pollen


    q.9- amniotic sac

    q.10- cerebellum

    q.12- fertilized egg splits into two zygotes

    q.14- cervix

    q.18- placenta

    q.20- lungs

    q.28- oxygen-rich blood.

    q.30-c. passive immunity

  • Anonymous
    5 years ago

    I have been blocked also. The same person who blocked @secretsauce also blocked me. She doesn't like it when her idiotic statements about evolution are refuted. I have also been reported and my answer deleted several times because those reporting me do not like it when I expose the lies they use about evolution. And it seems that it is impossible to get Y!A to reverse the deletion. For example, in a couple of cases the reporter had used links to web sites that used despicable arguments against evolution and I exposed them for being despicable. I tried to get my answer reinstated but apparently the hypocrisy of the deletion did not mean anything. By the way, it appears that my punishment for being reported is to have my avatar label as a Top Contributor also deleted. Added: @im: "You can be blocked from communicating with an Answers member, but you can't be blocked from answering the question of any Answers member. " Wrong! If the member blocks you, the question does not come up when you click on it. Instead there is a message saying you cannot access the question at this time. Added: @Mithroramir: "The big bang theory is the scientific creation story, but it claims that light cannot age (relativity theory) and yet it does age by virtue of the backround microwave radiation discovered by Penzias and Wilson. So which of these two mutually exclusive propositions is true? " You don't understand what the cosmic microwave background is. The expansion of space from the time of the big bang has stretched the original radiation to a much lower frequency. Big Bang theory held that the original radiation would have stretched by a certain amount and that amount was what was measured. That measurement provided confirmation of the Big Bang. You need to get your information from reliable sources (or is what you said just something that you erroneously came up with in your own mind).

  • 5 years ago

    describe the characteristics that distinguish the antigen

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