In humans, the exchanges of material between the embryo and its mother occur through

16 Jun In humans, the exchanges of material between the embryo and its mother occur through

Question
(1) In humans, the exchanges of material between the embryo and its mother occur through the

a. umbilical cord

b. amnion

c. yolk sac

d. endometrium

(2) The process of phosynthesis

a. breaks down sugars to create ATP

b. traps light energy in an energy carrier like ATP

c. produces carbon dioxide

d. occurs in some animal cells

(3) A solution with a pH of 3 is

a. acidic

b. nonpolar

c. basic

d. neutral

(4) Water an nutrient are taken up from soil by

a. guard cells

b. root hairs

c. root caps

d. xylem in tap roots

(5) While pruning your roses, you get scratched by a thorn. A few days later, you notice that the scratch is filled with yellowish pus. What s this pus?

a. neutrophils and macrophages that die after consuming their fill of the bacteria that entered your wound.

b. living bacteria that have been successful in avoiding your immune system

c. dead self cells and bacterial waste products

d. concentrated prostaglandins produced by injured tissue cells

(6) You are given an unknown substance and asked to determine whether it is polar or nonpolar. The easiest way to do this would be to

a. determine whether the compound is held together by hydrogen bonds

b. determine the number of electrons in the compounds’s outer shell

c. mis the compound with an ionic substance to see whether its bonds can withstand the pressure

d. determine whether the compound dissolves in water

(7) Dermal tissues typically

a. regulate what enters and leaves the plant

b. participate in wound healing

c. transport food and water

d. carry out photosynthesis

(8) Why is the head of a sperm covered with a sac of enzymes?

a. the enzymes are used to prevent other sperm from entering the egg after the sperm and egg membranes have fused

b. the enzymes are needed to digest a hole in the protective “shell” surrounding the egg

c. the enzymes are released to kill other sperm so that, by the time sperm reach the egg, only a hundred or so remain to compete with

(9) Lymphocytes develop from

a. macrophages

b. antigen-antibody interactions

c. neutrophils

d. stem cells in bone marrow

(10) A hurricane could cause genetic drift by

a. increasing the mutation rate of a population

b. randomly killing more males than females in a population

c. randomly killing more individuals of one genotype than another in a population

d. relocating a population to a different habitat

(11) Helper T cells

a. stimulate the proliferation of killer T cells when bound to their specific antigen

b. stimulate the proliferation of B cells when bound to their specific antigen

c. proliferate rapidly when bound to their specific antigen

d. all of the above

(12) You are looking at a cell under a microscope and trying to determine whether it is a prokaryote or an eukaryote. You know is is an eukaryote if you see

a. DNA

b. a plasma membrane

c. a nucleus

d. a cell wall

(13) The completion of the physical division of the parent cell during the last stage of mitosis is known as

a. centrosome formation

b. G0

c. cytokinesis

d. meiosis

(14) Consider the parts of the digestive system, particularly the place where water is removed before feces are excreted. Which organ is the mostly likely to be responsible for a bout of diarrhea?

a. colon

b. anus

c. stomach

d. esophagus

(15) Which of the following would you most likely find surviving in a boiling-hot spring?

a. an archean

b. bacteria

c. a eukaryote

d. none of the above

(16) Lipases help to digest

a. proteins

b. glucose

c. amino acids

d. fats

(17) Which of the following is true of the chromosomes in a homologous pair?

a. they both came from the organism’s mother

b they both came from the organism’s father

c. one chromosome came from the organism’s parents

d. neither chromosome came from the organism’s parents

(18) What characteristic is not shared by all living organisms

a. they make their own energy

b. they grow and develop

c. they evolve through time

d. they are composed of one or more cells

(19) The human immune system contains trillions of specialized cells of several kinds, all of which help destroy invaders. What are these cells called?

a. red blood cells

b. white blood cells

c. lymphatic cells

d. blood plasma

(20) When comparing certain amino acid sequences in the protein hemoglobin of humans to those of other animals, scientists found that baboons had seven different amino acids (than the human protein), dogs had ten different amino acids, gorillas had one different amino acid and lemurs had eight different amino acids. Which of these animals is most closely related to humans?

a. baboon

b. dog

c. lemur

d. gorilla