If the base pairs in a DNA helix are 0.34 nm apart, and a complete (360°) turn of the helix takes 3.4 nm, how many base pairs per turn are there in a DNA molecule?
What will be an ideal response?
There are 10 base pairs per turn.
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Many researchers hypothesize that modern humans have derived from the Homo ergaster populations that spread around the world starting about 2 million years ago. This hypothesis is known as the:
A. out-of-Africa hypothesis B. into-Africa hypothesis C. multiregional hypothesis D. uniregional hypothesis E. None of the answer options is correct.
Answer the following statements true (T) or false (F)
1. Prokaryotes are only found in the domain Bacteria. 2. Plastid organelles, such as mitochondria and chloroplasts, contain their own DNA and ribosomes. 3. Flagella move by way of dynein proteins that connect microtubules and force them to shift back and forth to bend or rotate the flagella. 4. As the cell doubles in dimensions from its original size, the surface area would increase much more than the internal volume of the cell. 5. Because mitochondria, chloroplasts, and other plastids have their own DNA and ribosomes within double membranes, they are also considered cells.
The accumulation of free oxygen in the atmosphere ____
a. was a result of the accumulation of a byproduct of a type of photosynthesis b. caused the further spontaneous generation of life c. provided the opportunity to extract more energy through anaerobic respiration d. occurred immediately after the earth was formed e. allowed for DNA to replace RNA as the primary data storage molecule
How is the lytic cycle different from the lysogenic cycle with respect to the infected host cell?
a. The host cell is allowed to live during the lytic stage. b. The host cell can only divide during the lytic stage. c. The host cell dies during the lytic stage. d. The viral DNA may integrate into the host genome during the lytic stage.