bio 151 exam 2 mc Flashcards
How many different sequences (permutations) can
there be for a DNA sequence made with six (6)
nucleotides?
- 46
- 64
- 4 ^ 6
- 6 ^ 4
- Infinite
4^6
Which of the following is not correct about RNA?
- RNA is found inside ribosomes
- RNA can base pair with DNA
- RNA can function as a catalytic molecule
- RNA is the hereditary material in some archaea
- RNA may have been the first self-replicating molecule
RNA is the hereditary material in some archea
“Charged tRNA” has all of the following except ___.
- Amino acids
- Anticodon
- Codon
- Double-stranded stems
- Single-stranded loops
codon
____ molecules are the least likely to cross a protein-
free phospholipid bilayer.
- Small, charged
- Large, charged
- Small, polar
- Large, polar
- Large, nonpolar
Large, charged
Phospholipids with unsaturated fatty acids may yield
_____ bilayers and may have ____ fluidity.
- Thicker; less
- Thinner; less
- Thicker; more
- Thinner; more
Thinner; more
Select THREE statements that accurately compare DNA
and RNA.
- RNA has phosphate groups in its backbone while DNA
does not.
- DNA has a base at 1’ carbon of ribose.
- DNA has a H group on the 2ʹ carbon of ribose.
- RNA has an OH group on the 3ʹ carbon of ribose.
- The nucleotide monomers in a strand of RNA are held
together with hydrogen bonds.
- DNA has a base at 1’ carbon of ribose.
- DNA has a H group on the 2ʹ carbon of ribose.
- RNA has an OH group on the 3ʹ carbon of ribose.
Which of the following metabolic pathways is central
to cellular metabolism in most cells?
- The citric acid cycle
- Glycolysis
- Electron transport chain
- Lipid degradation
- Peptide synthesis
glycolysis
This molecule is ___________.
- fatty acid
- glycerol
- Phospholipid
- unsaturated fat
- saturated fat
saturated fat
Which of the following is incorrect?
- Complex sugars are carbohydrates.
- All carbohydrates have the general formula
Cn(H2O)n.
- Polysaccharides are polymers of simple sugars.
- Carbohydrates have the most energy of all
macromolecules.
- Simple sugars contain only carbon, oxygen, and
hydrogen atoms.
Carbohydrates have the most energy of all
macromolecules
Which of the following THREE statements are correct
about diffusion.
- Diffusion is driven by entropy.
- Diffusion requires an input of energy.
- Diffusion does not require an input of energy.
- Diffusion across a cell membrane may occur through
protein transporters.
- Net movement of molecules is from areas of high
concentration to areas of low concentration.
- Diffusion is driven by entropy
- Diffusion does not require an input of energy.
- Diffusion across a cell membrane may occur through
protein transporters.
What is this nitrogenous base?
- Adenine
- Cytosine
- Guanine
- Thymine
- Uracil
guanine
Adding cholesterol ____ permeability because its
steroid rings ____ the density of the hydrophobic
membrane interior.
- Enhances; decreases
- Enhances; increases
- Reduces; decreases
- Reduces; increases
reduces; increases
Which of the following is incorrect about
mitochondria?
- Their genome is similar to a-proteobacteria.
- Their ribosomes are affected by certain antibiotics.
- They divide when cells divide.
- They have two layers of membranes.
- They have a circular DNA
They divide when cells divide
What happens to chloride ions when CFTR is missing
or non-functional?
- Chloride ions can still slowly diffuse through the
membrane.
- Chloride ions can still diffuse across the membrane
through channels that normally carry positive ions
like sodium or potassium.
- Chloride ions can no longer diffuse across the
membrane.
- Chloride ions will now diffuse across the membrane
in the opposite direction
Chloride ions can no longer diffuse across the membrane
Which of the following (as we know them today) came
last during evolution.
- Bacteria
- Chloroplasts
- Endoplasmic reticulum
- Mitochondria
- Eukaryotes
Chloroplasts
