The cytoplasmic membrane of both eukaryotes and prokaryotes functions to
A. form endoplasmic reticulum.
B. produce energy.
C.
regulate movement of molecules that enter and leave the cell.
D.
form lysosomes and Golgi apparatus.
C
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A student poses the question: How does the presence of dissolved salt affect the freezing point of water? To answer this question, the student set up two conditions. In the first condition, the student added salt to water in a container and referred to this condition as the variable. In the second condition, the student did not add any salt to water in a second container and referred to this
condition as the control. The student took both containers and attempted to freeze the water at various temperatures to assess the freezing point. Would this be a valid experiment? A. Yes, because there is more than one variable. B. Yes, because there is one variable and a control C. No, because there is not more than one variable D. No because there is only one variable and a control
According to the diversity-stability hypothesis:
A. A loss of any species from an ecosystem leads to an approximately equal decline in stability. B. Losing even a few species from an ecosystem causes a drastic decline in ecosystem stability. C. The loss of a few species from an ecosystem does significantly affect ecosystem functioning. D. Every species has an important role in ecosystem function, but we cannot predict the effect of species loss. E. Genetic diversity is the most important part of ecosystem stability.
Facilitated diffusion across a biological membrane requires ________ and moves a substance ________ its concentration gradient
A) energy... down B) transport proteins... down C) energy and transport proteins... against D) transport proteins... against
Which of the following most closely describes the cervix?
A. a neck-like area of the ovary B. a region between the uterus and vagina C. a narrowed opening from the prostate gland D. an opening from the vagina to the outside