Phospholipids ________.
A) are exclusively hydrophilic molecules
B) contain polar tails and nonpolar head groups
C) are both hydrophilic and hydrophobic in nature
D) form the lipid bilayer, with tails directed to the outside
Answer: C
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Cells The Living Units
- If a tRNA had an AGC anticodon, it could attach to a(n) ________ mRNA codon.
- Some hormones enter cells via ________.
- Crenation is likely to occur in ________.
- Extracellular matrix is ________.
- A gene can best be defined as ________.
- The functions of centrioles include ________.
- The endomembrane system is ________.
- Lysosomes ________.
- The main component of the cytosol is ________.
- Which of the following statements is most correct regarding the intracellular chemical signals known as "second messengers"?
- Which of the following is a principle of the fluid mosaic model of cell membrane structure?
- Cells are composed mainly of ________.
- Which of the following is a concept of the cell theory?
- In the maintenance of the cell resting membrane potential ________.
- Which statement is the most correct regarding transcription/translation?
- DNA replication ________.
- Peroxisomes ________.
- Ribosomes, endoplasmic reticulum, and the Golgi apparatus functionally act in sequence to synthesize and modify proteins for secretory use (export) only, never for use by the cell. This statement is ________.
- Mitochondria ________.
- Enzymes called _________ destroy the cell's DNA and cytoskeleton, producing a quick death to the cell.
- Passive membrane transport processes include ________.
- Which of the following is true regarding cells in humans?
- If the nucleotide or base sequence of the DNA strand used as a template for messenger RNA synthesis is ACGTT, then the sequence of bases in the corresponding mRNA would be ________.
- Hyperplasia means __________.