At what stage of human development would you expect to first see a beating heart?

Biology

2 answers:

lutik1710 [3]3 years ago

8 0

Answer:

Explanation:

I just did it on khan

IRINA_888 [86]3 years ago

6 0

at what stage of human development wuold you exept to first see abeating heart? the answer is ç

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Paper chromatography is a technique used to separate molecules based upon their size and solubility in a particular solvent. If

Tanya [424]

Answer:

a. Paper chromatography would separate the pigments into several bands that appear green or yellow/orange.

Explanation:

The primary or main pigment in plants is the chlorophyll. The chlorophyll gives plants their characteristics green colour and helps in the absorption of light during photosynthesis.

Other pigments in plants include carotenoid with its characteristic yellow, red or orange colour; anthocyanin with its re/blue colour and betalains with its red/yellow colour.

Hence, if pigments from a particular species of plant are extracted and subjected to paper chromatography, one would expect the pigments to be separated into several colour bands ranging from green to yellow/orange.

The correct option is a.

4 0

2 years ago

Part a - identifying the processes of replication, gene expression, and recombination this activity requires that you correctly

Naddika [18.5K]

I found the exercise on the internet with the images and brief descriptions. Attached is an image of it.

To the DNA replication bin:
-Image of one cell dividing into two cells, and the mother cell has its DNA being unfolded and replicated.
-"DNA -> 2DNA (copying one DNA molecule to make two identical DNA molecules)"

To the gene expression bin:
-Image of only one cell with some arrows within it indicating the gene expression flow: DNA -> mRNA -> protein
-"DNA->mRNA->protein"
-"transcription"
-"translation"

To the recombination bin:
-Image with two cells being one the donor and the other one the recipient. The recipient has DNA with different colours pretending to represent that its DNA has different origins.
-"transformation"
-"conjugation"
-"transduction"