If you put the following events in the order they occur in the human digestive system, which would be the third event in the series?
(A) Cells in gastric pits secrete protons.
(B) Pepsin activates pepsinogen.
(C ) HCl activates pepsinogen.
(D) Partially digested food enters the small intestine.

Which of the following is not an organ system?
a. muscular system
b. endocrine system
c. immune system
d. lymphatic system
e. integumentary system

After surgical removal of the gallbladder, a person might need to limit his or her dietary intake of (A) starch. (B) protein. (C ) sugar. (D) fat.

The temperature-regulating center of vertebrate animals is located in the ______.

Which of the following should be the same in identical twins?

(A) the set of antibodies produced

(B) the set of MHC molecules produced

(C) the set of $\mathrm{T}$ cell antigen receptors produced

(D) the susceptibility to a particular virus

Summarize the relationship between surface area and volume as a cell grows.

Compared with a smaller cell, a larger cell of the same shape has ______.

A. the same surface-to-volume ratio.

B. less surface area per unit of volume.

C. a smaller average distance between its mitochondria and the external source of oxygen.

D. a smaller cytoplasm-to-nucleus ratio.

Which of the following would NOT be seen in a cross section through the woody part of a root?

(A) sclerenchyma cells

(B) parenchyma cells

(C) sieve-tube elements

(D) root hairs

The oceans affect the biosphere in all of the following ways except

a. producing a substantial amount of the biosphere's oxygen.

b. removing carbon dioxide from the atmosphere.

c. moderating the climate of terrestrial biomes.

d. regulating the pH of freshwater biomes and terrestrial groundwater.

Which of the following would not be seen in a cross-section through the woody part of a root? a. sclerenchyma cells d. root hairs b. parenchyma cells e. vessel elements c. sieve-tube elements

What is the function of glycogen?

If you were to jog 1 km a few hours after lunch, which stored fuel would you probably tap? a. muscle proteins b. muscle and liver glycogen c. fat stored in the liver d. fat stored in adipose tissue e. blood proteins

If you were to jog 1 km a few hours after lunch, which stored fuel would you probably tap?

(A) muscle proteins

(B) muscle and liver glycogen

(C) fat stored in the liver

(D) fat stored in adipose tissue

If you were to jog 1 km a few hours after lunch, which stored fuel would you probably tap? (A) muscle proteins (B) muscle and liver glycogen (C ) fat in the liver (D) fat in adipose tissue