Introduction To Biology chap 12

A human bone marrow cell (in prophase of mitosis) contains 46 sister chromatids. How many chromatids does it contain altogether?

Nucleoli are present during _____.    interphase= Nucleoli are present during interphase.

Cytokinesis often, but n ot always, accompanies    Telophase

Chromosomes first become visible during    Prophase

Centromeres divide and sister chromosomes become full-fledged chromosomes during   Anaphase

Spindle fibers attach to kinetochores during _____.    Prometaphase

During prophase a homologous pair of chromosomes consists of _____.    2 chromosomes and 4 chromotids

During _____ both the contents of the nucleus and the cytoplasm are divided.

During the ___ phase of the cell cycle, the cell grows and replicates both its organelles and its chromosomes.    Interphase

The copying of chromosomes occurs during which of the following phases of the cell cycle?    S phase - Chromosomes must undergo replication before mitosis can occur; this copying occurs during the S phase.

For the first several divisions of early frog embryos, cells proceed directly from the M phase to the S phase and back to M without gaps. Which of the following is likely to be true about dividing cells in early frog embryos?

- Frog embryos do not have DNA.
- The cells do not divide by mitosis.
- The cells get smaller with each generation.
- The number of chromosomes decreases with each generation.      The cells get smaller with each generation

True or false? The M phase is characterized by the replication and division of a cell's chromosomes.    False - Cells replicate their chromosomes during the S phase and divide partition their chromosomes during the M phase.

If an organism normally has 34 chromosomes, how many molecules of DNA should there be in the G1 phase of the cell cycle?    34.

haplo    Simplesingle haploid

prefix a-, an- means     without, lack of

diplo-     douple

soma-   body, bodily

chrom   color, light

auto     self, by itself

Micro    small, short

gen       beginning, birth

Homo     The same

ploid      chromesome

uni-    single, not paired

BI     twice; double
Ex: biennial- happening every two years

Cyte    Cell Root word

tel    end, final

prefix mito- means?    thread

Inter       between ex. Internode

pro-     for, before, forward

Multi-    many, much  ex. multiparous (having given many births)

Kinet     Set in motion