Launchpad 8

At the start of mitosis, how many sister chromatids are present in a human cell? 46 23 12 92

92

If a mutation occurred in the cadherin gene so that the cytoplasmic domain no longer attached to the cytoskeleton, which of the following would occur? Cadherins in hemidesmosomes would no longer be anchored to intermediate filaments. Cadherins in desmosomes would no longer be anchored to intermediate filaments. Cadherins in desmosomes would no longer be anchored to microfilaments. Cadherins in adherens junctions would no longer be anchored to microtubules.

Cadherins in desmosomes would no longer be anchored to intermediate filaments.

DNA polymerase is the enzyme that separates the two strands of DNA during DNA replication. False True

False

Imagine that you are examining a mouse that does not produce basal lamina in the skin. How will this mouse be different from a normal, wild-type mouse? The epidermis and dermis will be strongly connected. The dermis will be disorganized and will lack blood vessels. All of these choices are correct. The epidermis will not be connected to the dermis. Cellular junctions will fail to form between the cells of the epidermis.

The epidermis will not be connected to the dermis.

an inhibitor of DNA polymerase activity

aphidicolin

an inhibitor of microtubule formation

colchicine

an inhibitor of actin microfilament assembly

cytochalasin

an inhibitor of ribosome activity (and therefore protein synthesis)

emetine

In nerve cells, the centrosome is located near the nucleus. Vesicles move from near the nucleus to the end of long extensions (axons) along microtubules. Based on these two facts, it is possible to conclude that these vesicles are moving in the _____ direction on the microtubule using the motor protein _____. minus end; kinesin plus end; dynein minus end; dynein plus end; kinesin

plus end; kinesin

Colchicine is a drug that is used in plant breeding to create polyploids. It blocks the assembly of microtubules. If dividing cells are treated with colchicine, at what stage of mitosis would you predict the arrest would occur? metaphase telophase G1 of interphase prophase late anaphase

prophase

In DNA replication, each individual parent strand acts as a _____ strand for the synthesis of a _____ strand. daughter; duplicate template; daughter template; duplicate duplicate; daughter daughter; template

template; daughter

When we say that DNA replication is semiconservative, we mean that: when DNA is replicated, each new double helix contains one parental strand and one newly synthesized daughter strand. parental DNA stays in the parent cell and daughter DNA ends up in the daughter cell. only half of an organism's DNA is replicated during each cell division. when DNA is replicated, one double helix contains both parental strands and one contains two newly synthesized daughter strands. None of the other answer options is correct.

when DNA is replicated, each new double helix contains one parental strand and one newly synthesized daughter strand.