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stiv31 [10]
3 years ago
8

In crime scene, as investigator you saw an alleged almost dried semen in the bedsheets at the crime scene. How will you collect

the specimen?​
Biology
1 answer:
Alenkasestr [34]3 years ago
7 0

Answer:

an investigator will often use a black light to scan an area for traces of bodily fluids left at the crime scene. if there’s a substance that resembles semen or blood, they will often times apply a spray if it is dry and use a cotton swab to collect it in a vial to test back at the lab for dna evidence.

Explanation:

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What type of membrane proteins are integral proteins that move ions or molecules across plasma membrane?
blsea [12.9K]

Answer:

Channel proteins and Carrier proteins

Explanation:

These are type of membrane proteins that transcend the entire length of  phosphoslipid  bi- layer  in the plasma membrane.They facilitate the movement of ions  and molecules across  the walls of the plasma membranes.

Generally, substances like glucose, amino acids, are too large to pass through the phopholipid bilayers. Likewise ions of  potassium, sodium calcium, because of their polarities can not pass through either. They are ferried across the phospholipid by  group of protein structures called channel proteins. Some are also transported across by carrier  proteins.  The process by which these protein structures  aided the  diffusion of substances across the phospholipid bilayer is called Facilitated diffusion.

Channel proteins are pores, that are filled with water molecules with the entrance  well gated.  That is the entrance  is controlled by part in the inner structure  of the protein  which can open or close the pores  like a gate to control the movement of ions across it. e.g Sodium channels are gated for  movement  of sodium ions by voltage or ligands(chemicals) during  nervous  transmission to elicits action potential. Like wise Potassium channels allow  diffusion of potassium ions across the phospholipid bilayers. it gates are shut when sodium channels are open; this  regulate ion exchange.

Their structures are well fixed in shape , specific  to the substance or ions being  transported;and the rate of diffusion  depends on  the like hood of opening of the gate or closure.

Carrier molecules  also in the membranes  do not have a fixed shape, and their transport  direction is determined by the direction of concentration gradients. Thus they can flip on either sides of the membranes to aid diffusion across. Their movement can  be both passive and active, and the rates  of diffusion depends on the number of available carrier proteins in the membrane. They are also specific to the ions they transport.And are not gated,

Therefore these two membrane integral  proteins  facilitate movements of substances across the phospholipild bilayers

8 0
3 years ago
During a humoral immune response, which of the following happens when a pathogen is recognized?
GarryVolchara [31]
I believe the answer is B. <span>The antibodies on B cells bind to the antigens on the pathogen's surface.
</span>
8 0
3 years ago
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The diagram below shows the structure of a protein. what is the structure labeled A
nydimaria [60]

Answer:

B. An amino acid

Explanation:

Have a great day/night! :3

8 0
3 years ago
BRAINLIEST QUESTION! ♥ How many kinds of atoms are in ammonia, NH4OH?
belka [17]
There are 4 atoms in ammonia.
6 0
3 years ago
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Translation and protein synthesis is occurring at the ribosome. If the tRNA anticodon being matched at the ribosome is AUG, what
Arada [10]

UAC

A<---> U

U<--->A

G<--->C

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