Water is a polar molecule, yet it easily moves through the nonpolar portions of cell membranes. Which transport process is responsible?
A) symport
B) uniport
C) simple diffusion
D) antiport
E) facilitated diffusion
C) simple diffusion
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Which of the choices below is a type of hormone that acts on neighboring cells without entering the bloodstream?
1. Local hormone 2. Paracrine 3. Autocrine 4. Circulating hormone a) 1 only b) 2 only c) 3 only d) 4 only e) Both 1 and 2
Adenine and thymine are examples of double-ring nitrogenous bases called pyrimidines.
Indicate whether this statement is true or false.
What process occurs as the zygote travels towards the uterus in the fallopian tubes?
A. Polyspermy B. Fertilization C. Cleavage D. Capacitation
During which stage of sexual response do sympathetic neurons constrict the arteries bringing blood to the penis?
A. Ejaculation B. Resolution C. Arousal D. Emission