Eukaryotic chromosomes are a combination of proteins and DNA, which allows the cell to perform which four essential functions?
What will be an ideal response?
1. compacts the DNA so it can fit in the nucleus
2. stabilizes the DNA to protect it from damage
3. promotes chromosome condensation required for cell division
4. regulates DNA replication and gene transcription
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Those organisms that can swim strongly against ocean currents are called:
a. plankton. b. neuston. c. nekton. d. macroplankton. e. epifauna.
Nutrition is the interaction between an organism and its ________
Fill in the blank(s) with correct word
HIV selectively destroys CD4 cells and as a result, a person with AIDS is susceptible to life-threatening viral infections. Knowing this, you can conclude that __________.
A) regulatory T cells are killed by the virus B) these viruses have T-dependent antigens C) B cells do not recognize viral antigens D) CD4 T cells need help from B cells to recognize viral antigens
Ecdysone, a steroid hormone, controls ____.
A. the menstrual cycle B. molting in arthropods C. the wake-sleep cycle D. the formation of hormone receptors E. the formation of sperm