12. Ribosomes are
A. composed of two subunits.
B. joined with mRNA to make proteins.
C. often associated with rough endoplasmic reticulum.
D. assembled in the nucleolus.
E. All of the answers are correct.
12. The mitotic spindle attaches to the centromere by inserting its microtubules in the
B. equatorial plate.
C. synaptonemal complex.
Learning Objective: 8.3. List the phases of
30. Meiosis and mitosis have a number of features in common. However, only meiosis has the following feature.
A. The presence of chromatids.
B. The pairing-up of homologous chromosomes.
C. The movement of chromosomes to the poles of the cell.
D. The conde
37. A geneticist is studying various phenotypic traits in the toes of rats that are controlled by a mixture of both recessive and
dominant alleles. He decides to cross some of his subjects with a new mutant strain that carries a dominant trait for no toes
42. In general, how much of cellular membrane mass is comprised of proteins?
43. Two models currently exist as to the mechanism behind how glycoproteins and polysaccharides are processed and
packaged in the Golgi apparat
17. Cells in the apical meristems of the roots of vascular plants divide by mitosis to produce
A. vascular tissue.
B. dermal tissue.
C. ground tissue.
D. vascular tissue and dermal tissue.
E. vascular tissue, dermal tissue and ground tissue.
18. Which tis
30. In eukaryotes, intermediate filaments are
A. strong, stable and resistant to stretching.
B. less rigid than microfilaments and provide less mechanical support than microtubules.
C. composed of actin and provide the cytoskeleton of the cell.
37. In the cell, oxidation of fuel molecules involves
A. the removal of electrons in a step-wise process.
B. oxidation of electron carrier molecules.
C. the direct reaction of fuel molecules with oxygen.
D. the addition of electrons in a step-wise process
23. If a phospholipid is added to water it tends to form a stable bilayer because
A. the hydrophilic tails exclude water.
B. the phosphate heads' are non-polar.
C. the molecule has both hydrophilic and hydrophobic groups.
D. lipids are insoluble in water.
22. In photosynthetic eukaryotes the enzymes for carbon fixation are found in the
A. chloroplast stroma.
B. plasma membrane.
C. chloroplast grana.
D. stromal lamellae.
23. ATP and NADPH produced in the light-dependent reactions of photosynthes
21. The distance between genes on a genetic map is calculated using
A. recombination frequency.
B. kilobases of DNA.
E. map distance.
Learning Objective: 9.5. Describe the consequences of
17. Which of the following provides evidence to show cytokinesis is independent of mitosis?
A. Cytokinesis does not begin until anaphase.
B. Anti-microtubule drugs applied to dividing cells inhibit chromosome separation but not cytokinesis.
C. A phragmopl
6. If 20 per cent of the bases of a DNA double helix are adenine, what percentage of bases are cytosine?
A. 10 per cent
B. 30 per cent
C. 20 per cent
D. 60 per cent
E. 80 per cent
Learning Objective: 10.1 Define the
43. Some chemical signal molecules are excluded from entering the cell whereas others are able to enter. Based on your
knowledge of the structure of cell membranes, which of the following signal molecules would be able to pass through the
32. Which of the following statements about water is INCORRECT?
A. Water molecules tend to stick to one another (cohesion) and to other molecules that have
charged surface groups to which water can hydrogen bond (adhesion).
B. The cohesive forces between
24. What is the role of telomeres in DNA replication in eukaryotes?
A. Telomerase adds repeat sequences to telomeres for primer attachment.
B. The initiation of replication at the 5' end of the telomere.
C. Telomeres are the site of action of restriction
27. The purpose of the cytochromes in electron transport chains is to
A. release energy in small quantities without a large loss to heat.
B. reduce NADH to NAD+.
C. reduce Fe3+ to Fe2+.
D. convert oxygen to water.
E. recycle ADP.
28. Which of the following responses is mediated by intermediate proteins and second messengers?
A. An electrical signal is generated when a mechanoreceptor is distorted by water movement.
B. The rate of synthesis of a particular protein is increased when
45. Which of the following statements about glucose is CORRECT?
A. It is a metastable compound.
B. It has the chemical formula of C6H11O6.
C. It is not a monomer.
D. It consists of a sucrose and a fructose molecule.
E. In a biological sense, energy is ext
41. You attend a meeting with undergraduate students who are discussing the structure of proteins. Student one argues
that the formation of tertiary structures comes after quaternary processing, while student two maintains that tertiary
structures are typ
17. A symport is a
A. carrier with two binding sites that transports two substances in opposite directions.
B. channel with two binding sites that transports two substances in opposite directions.
C. carrier with two binding sites that transports two subs
18. The double mitochondrial membrane allows the generation of potential energy because the
A. composition and chemical structure of the inner and outer membranes are very similar.
B. inner membrane is highly permeable to most substances allowing ions to
6. Phospholipids are important
A. as hormones.
B. as a component of deoxyribonucleic acid.
C. in the formation of cell membranes.
D. as components of ribosomes.
E. for intracellular transport of energy.
F. attraction between positively and negatively char
17. An element is a substance made up of
A. one type of atom only.
B. one type of molecule only.
C. at least two different types of atoms.
D. one atom linked to a different atom by a covalent bond.
an atom with one neutron and one proton in the nucleus
9. Which of the following is not an important organic molecule in human cells?
D. Amino acids
10. Which of the following statements about functional groups is INCORRECT?
A. Organic molecules consist predo
33. Which of the following compounds is made of protein?
34. All nucleic acids
A. are composed of amino acids.
B. are found within the nucleus of the cell.
C. are composed of nucleotides.
D. are glucose
40. Which of the following statements about Gregor Mendel is INCORRECT?
A. Mendel was able to successfully quantify his results because he applied a robust scientific method to his observations.
B. Mendel's data, when first published, was met with widespr
3. Atoms of the same element can exist in different forms called isotopes. The most common isotope of carbon is
carbon-12 but it has two less-common isotopes, carbon-13 and carbon-14. The less-common isotopes have
A. the same number of electrons but more