True or False: the first cells were surrounded by a membrane composed largely of lipids synthesized by intracellular proteins
A. true
B. false
Answer Key: B
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You find a mutant Drosophila larva that is lacking anterior structures. You know that this embryo had normal amounts of Bicoid protein. What other type of mutation could cause this result?
A. A hunchback mutation that inhibits Hunchback production. B. A hunchback mutation that causes Hunchback overproduction. C. A maternal effect gene mutation that inhibits the production of a maternal gene product. D. A segmentation gene mutation that inhibits production of a segmentation gene product. E. A segmentation gene mutation that causes the overproduction of a segmentation gene product.
Using your knowledge of the feedback loops of human female hormones, which of the following would you predict is the result of high levels of estrogen and progesterone in the blood?
a. lack of growth of the corpus luteum b. absence of monthly ovulation c. increased secretion of FSH d. increased levels of LH e. increased menstrual flow
Which of the following are the main decomposers of the world?
A. Bacteria B. Fungi C. Protistans D. A & B only E. A, B, & C
Aseptic technique is a standard lab practice that includes all of the following EXCEPT __________.
a. elimination of all oxygen during any processes to prevent contamination b. preventing contamination of unwanted microbes present on solids, in liquids, and in the air c. preventing airborne contaminants from accessing nutrient-rich environments in culture d. using careful methods to sterilize equipment used to transfer and isolate colonies