If a short-day plant has a critical night length of 15 hours, then which of the following 24-hour cycles will prevent flowering?
a) 4 hours light/20 hours dark
b) 8 hours light/8 hours dark/light flash/8 hours dark
c) 6 hours light/2 hours dark/light flash/16 hours dark
d) 8 hours light/16 hours dark
e) 2 hours light/20 hours dark/2 hours light
Answer: b) 8 hours light/8 hours dark/light flash/8 hours dark
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You are attempting to identify the type of helminth that has been isolated from a patient stool sample. The most important consideration to make this distinction is to
A. look at the gross anatomy to determine if the body is segmented or not. B. ask the patient about recent food and water consumption. C. determine if the cells are eukaryotic or bacterial by looking for nuclei. D. examine the sample to see if microscopic eggs are present.
Some genes encoding proteins that are essential to
the survival of the organism are called highly conserved sequences. Which of the following is an example of one of these proteins? a. cytochrome b b. muscle structural proteins c. carbohydrate hydrolyzing genes d. skin pigmentation e. keratin
Which of the following hormones stimulates the release of a future egg cell by the ovaries?
A) luteinizing B) follicle-stimulating C) oxytocin D) prolactin
Cancer treatments may specifically target rapidly dividing cells by using drugs or chemicals that ____
a. promote DNA replication only b. inhibit DNA repair enzymes only c. inhibit DNA replication only d. promote DNA replication or inhibit DNA repair enzymes e. inhibit DNA replication or DNA repair enzymes