For your eye to focus on this sentence:a
the ciliary muscle would need to contract for the lens to get rounder.
b. the ciliary muscle would need to contract for the lens to get flatter.
c. the ciliary muscle would need to relax for the lens to get rounder.
d. the ciliary muscle would need to relax for the lens to get flatter.
e. the ciliary muscle is not connected to the lens and therefore, not involved in vision.
A
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A set of genetic markers located close together on a single ____________________ is called a haplotype
Fill in the blank(s) with correct word
Food chains rarely have more than three levels of consumers because
a. the animals are too large to search for prey. b. the growing season of plants is not long enough. c. pyramids do not go that high. d. the amount of energy available is too small. e. humans intervene.
Some applications in biology, such as polymerase chain reaction (PCR), require melting the DNA double helix into single strands of DNA. This can be accomplished by heating the DNA. As DNA is heated, why does the double helix structure denature into single strands of DNA but not into individual nucleotides? In other words, why do the single strands remain intact even though the double helix does not?
A. The double helix structure is important for DNA replication, while the single strands carry the information. B. The single strands are wrapped around histones, which protects them from denaturing. C. The double helix is held together with phosphodiester bonds, while the single strands are linked by hydrogen bonds. D. The double helix is held together with hydrogen bonds, while the single strands are linked by phosphodiester bonds.
How can signal molecules remain outside of cells but still create changes in activity inside cells?
A. Signal molecules act via plasmolysis. B. Signal molecules bind to specific receptor proteins on the outside surface of the plasma membrane. This triggers a chain reaction of events that passes the signal to molecules inside the cell. C. Active transport is required for signal molecules to transmit their signals. D. Signal molecules act through exocytosis.