Biology Ch. 12

Study guide

When griffuith mixed heat killed harmful bacteria with live harmless bacteria injected it into mice all the mice died

True

When scientist DNA transmits information they really means it passes information from one generation to the next

True

DNA is a nucleic acid made up of nucleosomes

FALSE: nucleotides

The nucleotides within a DNA strand may have different nitrogen bases but all of them have identical sugars

True

Chargaff contributed to the understanding of DNA by figuring out the percentage of adenine and thymine are almost always equal

True

Watson and crick took the image taken by Roslyn Franklin to figure out the structure of DNA

True

If proteins had been responsible carrying genetic information hersery and chase whould have observed that their bacterias was marked with radioactive sulfur

True

Watson and crick discovered that covalent bonds hold base pairs together at the center of a DNA strand

False; Hydrogen bonds

Chargaff concluded that the percentages of the 4 nitrogen bases should always add up to 90%

FALSE; 100%

The replication of a DNA molecule results in 4 copies of the same gene

FALSE; 2

DNA is tightly wrapped around nucluosomes

true

A DNA strand that has the sequences TACGTT would have the complemant strand ATCGAT

FALSE- ATGCAA

in eukaryotes DNA replication proceeds in one direction on the DNA molecule

FALSE; both directions

One sugar one phosphate one nitrogen base makes up a _____

Nuciotide

AGCT complement strand is _____

TCGA

The Watson and crick module of DNA is a _____

Double Helix

In griffiths experiment the ___ from the harmful bacteria was transferred to the harmless bacteria and transformed it

Genetic material (DNA)

____ are weak bonds that hold two strands of DNA together

Hydrogen bonds

If covalent bonds hold the strands of DNA together the two strands could not be easily separated and ____

Replicated

If the % of adenine in a DNA molecule is 30 what is the % of it is guanine?

20

Chromatin contains proteins called _____

histones

DNA replication is carried out by a series of ____

enzymes

The tips of chromosomes are known as?

telomeres

A procraiotic cell replicates its ___ before it splits into 2 new cells

DNA

unkariotic DNA has more replication forks that prokarotice because it has way more starting places or _____

Origins of replicaion