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Notes Taken From Khan Academy Videos for Cellular and Molecular Biology series.

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Cellular and Molecular Biology Lesson 1 of 5 - Cells

Question 1 of 31

1

___ Is the substance that is more of, the dissolve-r.

Select one or more of the following:

  • Solvent

  • Solute

  • Steve Martin

Explanation

Question 2 of 31

1

____ is the substance that is being dissolved (usually less of).

Select one or more of the following:

  • Solvent

  • Solute

  • Steve Martin

Explanation

Question 3 of 31

1

Diffusion is______________

Select one or more of the following:

  • The passive movement of molecules along a concentration gradient

  • The active movement of molecules along a concentration gradient

  • Dis-arming of nuclear weapons

  • Steve Martin

Explanation

Question 4 of 31

1

A concentration gradient ________________

Select one or more of the following:

  • moves from regions of high concentration to low concentration

  • moves from regions of low concentration to high concentration

  • is like a grading curve

  • a scale of concentrations

  • Steve Martin

Explanation

Question 5 of 31

1

hypertonic

Select one or more of the following:

  • is Steve Martin

  • is the higher concentration solution

  • is the lower concentration solution

  • is neither higher nor lower concentration

  • is a kid on pixie stix

Explanation

Question 6 of 31

1

hypotonic

Select one or more of the following:

  • is Steve Martin

  • is the lower concentration solution

  • is the higher concentration solution

  • is neither higher nor lower concentration

  • a hippo's tonic and gin

Explanation

Question 7 of 31

1

hyper- = ?

Select one or more of the following:

  • having a lot of something

  • having nothing

Explanation

Question 8 of 31

1

hypo- = ?

Select one or more of the following:

  • Not a lot of something

  • A big deal

Explanation

Question 9 of 31

1

Osmosis is

Select one or more of the following:

  • the active movement of water molecules through a membrane

  • the passive movement of water through a permeable membrane

  • the passive movement of water through a semi-permeable membrane

  • diffusion of water from one place to another

  • Steve Martin

Explanation

Question 10 of 31

1

Osmosis is the movement of water from the

Select one or more of the following:

  • hypotonic to the hypertonic

  • hypertonic to the hypotonic

  • good to the bad

  • big to the small

  • hard to the soft

Explanation

Question 11 of 31

1

Which has a nucleus?

Select one or more of the following:

  • eukaryote

  • prokaryote

  • the rock lobster

Explanation

Question 12 of 31

1

Which is not usually as complex or as large as the other?

Select one or more of the following:

  • prokaryote

  • eukaryote

Explanation

Question 13 of 31

1

An Organelle is ___________

Select one or more of the following:

  • a membrane bound substructure in the cell.

  • an organ

  • rare in cells

  • only found in prokaryotes

  • hard to define

Explanation

Question 14 of 31

1

Which of these is not an organelle?

Select one or more of the following:

  • ribosome

  • vacuole

  • vesicle

  • plastid

Explanation

Question 15 of 31

1

Which of these organelles have their own DNA?

Select one or more of the following:

  • plastid

  • Endoplasmic Reticulum

  • golgi body

  • vesicle

  • mitochondria

Explanation

Question 16 of 31

1

the Chloroplast is the most famous plastid type.

Select one of the following:

  • True
  • False

Explanation

Question 17 of 31

1

Plastids are found in both plant and animal cells.

Select one of the following:

  • True
  • False

Explanation

Question 18 of 31

1

Mitochondria:

Select one or more of the following:

  • posses their own DNA inherited from the maternal line

  • are energy factories for the cell, and produce ATP

  • have an inner and an outer membrane

  • are unique only to animal cells

Explanation

Question 19 of 31

1

Plastids have their own DNA.

Select one of the following:

  • True
  • False

Explanation

Question 20 of 31

1

In terms of DNA and/or RNA, replication is:

Select one of the following:

  • when the cell copies itself

  • the creation of mRNA

  • The synthesis of a duplicate copy of DNA from a template pair of strands

Explanation

Question 21 of 31

1

During replication, the double stranded DNA is separated by ____

Select one of the following:

  • DNA helicase

  • RNA helicase

  • zipper gene

  • zipper enzyme

Explanation

Question 22 of 31

1

The step from DNA to RNA is called

Select one of the following:

  • Transcription

  • Translation

  • Replication

Explanation

Question 23 of 31

1

What does DNA stand for?

Select one of the following:

  • Deoxyribonucleic acid

  • Deoxixribonucleic acid

  • Deoxinucleic acid

Explanation

Question 24 of 31

1

What is tRNA?

Select one of the following:

  • small RNA molecules containing 75 to 95 nucleotides and carriers of amino acids and participate in protein synthesis.

  • the transcriptional blue print for a protein that is used to code the proteins structure

  • used to make copies of DNA during replication

Explanation

Question 25 of 31

1

Which of these occur inside the nucleus?

Select one of the following:

  • replication

  • transcription

  • translation

Explanation

Question 26 of 31

1

________: long chains of DNA wrapped around each other. DNA exists like this only during limited periods of the cells life, and DNA is not really usable in this bundled structure.

Select one of the following:

  • Chromosome

  • Chromatin

  • Chromatid

Explanation

Question 27 of 31

1

_______: how DNA usually exists within the cell, in a loose, usable state within the nucleus. DNA + Structural Proteins (such as histones).

Select one of the following:

  • Chromasome

  • Chromatin

  • Chromatid

Explanation

Question 28 of 31

1

Comes from a word that means "color"

Select one or more of the following:

  • "chromo"

  • "some"

Explanation

Question 29 of 31

1

Comes from a word that means "body"

Select one or more of the following:

  • "Chromo"

  • "Some"

Explanation

Question 30 of 31

1

A structural protein that DNA is wrapped around in the nucleus:

Select one or more of the following:

  • histone

  • histamine

  • helicase

Explanation

Question 31 of 31

1

_______: is an element/part of a chromosome, and is usually joined to another of itself by the centromere of a chromosome.

Select one or more of the following:

  • chromatin

  • chromatid

Explanation

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