Biology

review the section "investigating life: the tiniest compass." what's survival advantage my bacteria with magnetosomes have?

bacteria waste less cellular energy swimming to locations with optimal oxygen concentrations

What labels with correctly fill the empty oval next to cells in the concept map?

cytoplasm, cell membranes, ribosomes, RNA

As the cell theory developed, in what chronological order did the following events occur?

1. Cells were first called cells 2. microscopic evidence seem to support spontaneous generation 3. The nucleus was described in 1830 4. The cell theory was introduced 5. evidence lead scientist to accept the hypothesis that sells arise from pre-existing cells 6. Focus of cell research turns towards DNA research 7. cell research led to classifying life into three different domains, instead of two

select all the structures that are found in all living cells

1. DNA 2. RNA 3. Proteins 4. Ribosomes 5. Cell Membrane

what might occur in a cell lacking lysosomes

1. Old and worn-out cell parts would not be recycled. 2. Digestion of bacteria that are engulfed by the cell would not take place. 3. hydrolysis of polymers into monomers would not be carried out properly

what structure in plant cells stores salt, sugars, and pigments, contains enzymes that recycle and degrade molecules, and expands to exert turgor pressure

Central vacuole

drag each label to the type of microscope it describes. Each answer is used once

Light microscope - provides the lowest level of magnification, provides the lowest level of resolution, allows for the viewing of live samples, provides true color images Transmission election microscope - could be used for observing the Golgi apparatus, provides the highest level of resolution Scanning electron microscope - requires sample to be coated in metal particles, can provide only surface images

Consider your knowledge about the cell membrane and check all of the true statements below.

Phospholipids can self-assemble into a sphere without the help of proteins. Steroids in cell membranes affect membrane fluidity as temperature changes. Phospholipid bilayers surround all eukaryotic cells. Both plant and animal cell membranes are considered fluid mosaics.

plant cells do not contain contractile vacuoles, and watering plants cause their cytoplasm to become more dilute. What happens when a plant is watered?

The cells swell

select all of the following that are true of the phospholipid bilayer

The fatty acid chains of the phospholipids make the middle section hydrophobic. steroids in bedded in the bilayer allow the membranes to remain fluid at various temperatures. some proteins embedded in the membrane help with transporting large molecules through the bilayer. plasmodesMata in plant cells and gap Junctions in animal cells allow for direct exchange of material between adjacent cells.

A saturated triglyceride molecule is a lipid that consist of a glycerol backbone attached to three saturated fatty acids, which are fatty acids that have single bonds between all the carbons. On the other hand, a phospholipid molecule consist of a glycerol backbone attached to two fatty acids, some of which are unsaturated and contains one or more double bonds, and instead of a third fatty acid, the glycerol backbone in a phospholipid is bonded to a phosphate group within attach charged molecule suppose a researcher successfully produced a membrane composed of saturated triglycerides rather than from phospholipids. What characteristics would you expect the saturated triglyceride membrane to have? Select all that apply

The saturated triglyceride would not form a bilayer. Hydrophobic molecules would be attracted to the membrane.

Review the section investigating life: the tiniest compass. The figure below represents some of the experiments that researchers conducted. What tube shows bacteria finding their optimum O2 concentration level without a magnetic field?

The tube that has bacteria going in all different directions.

The lysosome contains which type of enzymes

enzymes that break down large molecules into smaller molecules

what parts of the cell did hydrolytic enzymes pass through on their way to lysosomes?

in the rough endoplasmic reticulum and in the Golgi apparatus

drag each label to all of the domains to which it applies. (Domain Eukarya)

membrane composed of fatty acid lipids, typical size is 10 to 100 micro meters, nucleus present in cells, organisms consist of one or more cells

select all of the following that correctly describe plant cell membranes.

plant cell membranes are surrounded by a cell wall made of polysaccharides phospholipids form a bilayer in plant cell membranes

drag each label to all of the domains to which it applies. (domain bacteria)

prokaryotic cells, membrane composed of fatty acid lipids, typical size is 1 to 10 micrometers, membrane bounded organelles absent

drag each label to all of the domains tu age applies. (Domain Archaea)

prokaryotic cells, typical size is 1 to 10 micrometers, membrane bounded organelles absent, membrane composed of non-fatty acid lipids

Click on the structures that all cells have select all that apply

ribosomes, cell membrane, DNA

What is one way that bacterial and archaeal cells differ from each other?

their cell membranes are made of different kinds of molecules

Select all of the following that are functions of membrane protein transport chemicals into and out of cell form plant cell wall provide binding site for cholesterol serve as cell recognition signals anchor cell membrane to cytoskeleton

transport chemicals into in out of cell Service cell recognition signals anchor cell membrane to cytoskeleton

What cells will be expected to contain the greatest number of lysosomes?

white blood cells