After performing a Gram stain on a mixed culture of Gram-positive and Gram-negative cells, you realize that you
omitted the iodine step. What would you expect to see if you observed the slide under the microscope?
a. pink Gram-positive and purple Gram-negative cells
b. purple Gram-positive and pink Gram-negative cells
c. pink Gram-positive and pink Gram-negative cells
d. colorless Gram-positive and pink Gram-negative cells
e. colorless Gram-positive and colorless Gram-negative cells
ANSWER: c
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Which structure stores motile sperm?
A. epididymis B. seminal vesicle C. testis D. vas deferens E. prostate gland
Playing catch with your young son, you blithely mention, “Wow, you must have excellent Ruffini endings.” He replies, “No, Mommy! My Ruffinis are beginnings!” Both of you laugh, but you explain that Ruffini endings are very helpful to humans catching balls. How do they help?
a. They detect impact stress, like when a ball hits a hand or glove. b. They detect pain when a ball hits the hand hard enough to hurt. c. They detect skin stretch and deformation in joints, allowing for object gripping. d. They detect deep pressure such as one feels when gripping a ball hard preparing to throw.
Is it reasonable to conclude that the 45 kDa protein is involved in shell pigment production?
a. Yes b. No
Almost all plasmids are double-stranded DNA
Indicate whether the statement is true or false.