?Puppies born too large experience difficulties during birthing and tend to have respiratory and other problems. Puppies born too small often can’t compete with their siblings for their mother’s milk. Thus, puppies of intermediate size have a survival advantage. This is an example of ____ selection

A microbiologist is studying the growth of a particular strain of bacteria to determine when it will transition from exponential growth to stationary phase and from stationary phase to death phase. Which of the following methods of measuring microbial growth would be best for this purpose?

A. Determining dry weight of microbes B. Viable plate count C. Turbidimetric measurements using a spectrophotometer D. Direct microscopic count

How many Barr bodies would you expect to see in the cells of an individuals with sex chromosome complement XXX?

A) 0 B) 1 C) 2 D) 3 E) 4

In plant cells, vesicles transport proteins from the Golgi apparatus to

a. lysosomes. b. vacuoles. c. chloroplasts. d. mitochondria.

Cells use membranes to help maintain set ranges of ion concentrations inside and outside the cell. Which of the following ions is the most abundant outside a typical mammalian cell?

(a) Na+ (b) K+ (c) Ca2+ (d) Cl–