The tails of some bacteriophage
A. exhibit oar-like motion that drives the phage genome into the cytoplasm of the host.
B. include a tail sheath that shortens.
C. rotate like flagella to drive the phage genome into the cytoplasm of the host.
D. None of the choices are correct.
Answer: B
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The mammalian acrosome contains enzymes that
a. digest the zona pellucida. b. digest the endometrium. c. stimulate ovulation. d. stimulate sperm motility. e. inhibit premature ejaculation.
____ is a random change in allele frequency
over time that is brought about by chance.
a. Genetic drift b. Gene flow c. Natural selection d. Disruptive selection e. Balanced polymorphism
Cells must efficiently transfer energy from their energy-trapping systems to the systems actually carrying out work and also use various metabolic processes to replace the energy used in doing work. This is called the ________.
Fill in the blank(s) with the appropriate word(s).
Upon closer inspection of the leaves of "flower of stone," one can observe tiny, cone-like structures. Each cone-like structure emits spores of two different sizes
Further investigation also reveals that the roots of "flower of stone" branch only at the growing tip of the root, forming a Y-shaped structure. Based on these additional observations, which of the following can be properly inferred about "flower of stone"? 1. It is heterosporous. 2. It is a fern. 3. The cone-like structures are sori. 4. It is a lycophyte. 5. It has separate male and female gametophytes. A) 1 and 5 B) 2 and 3 C) 1, 2, and 3 D) 1, 4, and 5